AceShowbiz -

Wanna know everything about "The Mysteries of Pittsburgh"? Just ask Mena Suvari and Jon Foster as both movie actors have joined the already on-board cast of the upcoming comedy drama, like Sienna Miller and Peter Sarsgaard.

Based on Pulitzer Prize winner Michael Chabon's debut novel, the Rawson Thurber's direction chronicles the last summer of Art Bechstein's (Foster) youth.

The story begins when Art meets the witty and beautiful Arthur Lecomte, who then introduces Art to the equally stunning Jane (Miller), her boyfriend, the legendary Cleveland (Sarsgaard), and worldly, exotic and slightly eccentric Phlox (Suvari). In the course of one summer, this band of colorful friends guides and thwarts Art in surprising ways as he confronts himself, his family, his sexuality and the heartache of growing up.

Filming on "The Mysteries of Pittsburgh" will begin after Labor Day in Pennsylvania.